/*
 * Copyright (C) 2017-2019 Dremio Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.dremio.exec.server;

import java.util.Optional;

import com.dremio.exec.record.BatchSchema;

/**
 * Provides batch schema for jobs.
 */
public interface JobResultSchemaProvider {

  /**
   * Get batch schema for given job id, if the job is complete.
   *
   * @param jobId    job id
   * @param username username
   * @return optional batch schema
   */
  Optional<BatchSchema> getResultSchema(String jobId, String username);

  JobResultSchemaProvider NOOP = (jobId, username) -> Optional.empty();
}
